Index: COFF/Driver.cpp
===================================================================
--- COFF/Driver.cpp
+++ COFF/Driver.cpp
@@ -975,6 +975,13 @@
 }
 
 void LinkerDriver::link(ArrayRef<const char *> ArgsArr) {
+  // Needed for LTO.
+  InitializeAllTargetInfos();
+  InitializeAllTargets();
+  InitializeAllTargetMCs();
+  InitializeAllAsmParsers();
+  InitializeAllAsmPrinters();
+
   // If the first command line argument is "/lib", link.exe acts like lib.exe.
   // We call our own implementation of lib.exe that understands bitcode files.
   if (ArgsArr.size() > 1 && StringRef(ArgsArr[1]).equals_lower("/lib")) {
@@ -983,13 +990,6 @@
     return;
   }
 
-  // Needed for LTO.
-  InitializeAllTargetInfos();
-  InitializeAllTargets();
-  InitializeAllTargetMCs();
-  InitializeAllAsmParsers();
-  InitializeAllAsmPrinters();
-
   // Parse command line options.
   ArgParser Parser;
   opt::InputArgList Args = Parser.parseLINK(ArgsArr);
Index: test/COFF/lib-module-asm.ll
===================================================================
--- test/COFF/lib-module-asm.ll
+++ test/COFF/lib-module-asm.ll
@@ -0,0 +1,21 @@
+; PR41803: llvm-link /lib on object with module asm crashes
+; RUN: rm -f %t.lib
+; RUN: llvm-as -o %t.obj %s
+; RUN: lld-link /lib /out:%t.lib %t.obj
+; RUN: llvm-nm -M %t.lib | FileCheck %s
+
+target datalayout = "e-m:x-p:32:32-i64:64-f80:32-n8:16:32-a:0:32-S32"
+target triple = "i386-pc-windows-msvc19.11.0"
+
+module asm ".global global_asm_sym"
+module asm "global_asm_sym:"
+module asm "local_asm_sym:"
+module asm ".long undef_asm_sym"
+
+; CHECK: Archive map
+; CHECK-NEXT: global_asm_sym in {{.*}}lib-module-asm.ll.tmp.obj
+
+; CHECK: lib-module-asm.ll.tmp.obj:{{$}}
+; CHECK-NEXT:         T global_asm_sym
+; CHECK-NEXT:         t local_asm_sym
+; CHECK-NEXT:         U undef_asm_sym